摘要
描述了2009年夏季针对胶东半岛沿海海雾灾害爆发进行的一次现场调查过程,详细分析了当时的地面、高空天气形势,以及对引发这次海雾过程的物理机制展开讨论。得出水气温差条件在2°—4℃之间,海表相对湿度以及低层大气相对湿度达到90%以上,低层风向以南风为主,风速3—4级之间是最有利于黄海出现平流雾的大气物理条件。利用WRF模式对本次事件进行了模拟,并计算了大气的水平能见度分布。结果表明,该模式能较好地模拟出黄海海域实际的海雾生消过程,对海雾的三维结构有一定的模拟能力。
In this paper,we have investigated a dense fog event occurred around the coastal region of the Jia-odong peninsula during the summer of 2009.The detailed synoptic situation are examined and physical mecha-nism are discussed.As shown in the result,the sea fog occurrence depends on air temperature and sea surface temperature（SST）.The frequency of sea fog increases greatly when the air-sea temperature difference is in the range of 2-4°C;and the sea surface relative humidity is more than 90%;and the lower layer prevailing wind force is in 3-4 grade.The sea fog event is simulated by WRF model and the area of lower horizontal visibility is calcu-lated based upon the model outputs.The modeled sea fog region agree well with the observational data,indicat-ing that the model can reproduce the evolutionary process of a real sea fog event well.The model presented is ca-pable of simulating the three-dimensional structure of sea fog.
出处
《海洋预报》
2011年第6期24-32,共9页
Marine Forecasts
关键词
海雾
天气形势
物理机制
数值模拟
水平能见度
sea fog
synoptic situation
physical mechanism
numerical simulation
horizontal visibility
